maybe it helps when you make the insulation better, your numbers indicate that you constantly lose a lot of heat into the room. heating the whole room a bit would of course fix the problem, but its expensive.
i found out that RHP means radiant heat panel i dont see why you would want that. there is no reason to mix different products. you could just put more of the heat tape you are already using on top of the terrarium, and put a wood panel on top (or the next terrarium). same effect. except that you dont have this thick white thing in the enclosure. you could also increase the suface area of the heat tape, or install some on the sides. just put it on the outside and add some wood, so that the heat goes in. i like wood, but the plastic in the animal plastics stuff seems to be designed to handle just that. insulation around it will make the heating more effective.
Not sure if you're if you're kidding or not, but please don't suggest this to people. Heat tape does not create ambient heat. That's why people use RHPs.
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0.1 Reg. BP Het. Albino (Faye),
1.0 Albino BP (Henry),
0.1 Pastave BP Het. Pied (Kira)
1.0 Pied BP (Sam)
1.0 Bumble Bee BP (Izzy)